/Engine/Plugins/Animation/IKRig/Source/IKRigEditor/Public/RigEditor/IKRigEditorController.h
Show user the new retarget chain they are about to create (provides option to edit name)
[FName](API\Runtime\Core\UObject\FName) PromptToAddNewRetargetChain ( [FBoneChain](API\Plugins\IKRig\Rig\FBoneChain) & BoneChain ) const